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(No Model.) 2 Sheets-Sheet 1.

T J MQTIGHE & J. T. MOGONNELL.

ELECTRIC ABC LAMP.

Patented Nov. 20, 1883.

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(No Model.)

T. J. MQTIGHE 88 ELECTRIC ARC LAMP.

Patented Nov. 20, 1883.

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UNiTEn STATES PATENT GEETQE.

THOMAS J. MCTIGHE AND JOSEPH T. MCCONNELL, OF PITTSBURG, PA.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 288,831, dated November 20, 1883 A ears. filed July 30, 1883. N0 model.)

To aZZ whom it may concern:

Be it known that we, THOMAS J MOTIGHE and JOSEPH T. llTCCONNELL, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Electric-Arc Lamps; andwe do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to IO which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, in which Figure 1 is an elevation of the upper works I 5 of an arc-lamp according to our invention, one of each pair of helices being removed and the armature-yoke in section. Fig. 2 is aside elevation of the suction-armature. Fig. 3 is a plan of the lamp with upper plate, helices,

2o armature, and lever removed. Fig. eisasection of the pinion and box with red.

This invention has relation to electric arc lamps of that class wherein a carbon provided with a rack is fed downwardly by its own weight, its rate of progression or feed being regulated by mechanism controlled by a main actuating-magnet in circuit with the are, and a magnet in a hi gh-resistance derivation around said are.

The invention consists in the provision of means for compensating for the unequal or varying attractive power of the main actuating and shunt magnets; in the provision of means for regulating the rate of motion of the carbonrod; in the provision of means for releasing the feeding mechanism and permitting it to act at a predetermined point by an exceedingly slight movement of the armature by which said feeding mechanism is sustained;

and, finally, in the novel arrangement and combination of parts, as hereinafter fully described.

Referring to the accompanying drawings, A represents the top and B the bottom plate 4 5 of the lamp-works.

O is the main magnet, and D the shunt depending from top plate, A, on opposite sides of the carbon rod E. The latter passes through the plates A and B, and has at one side a rack, a, with which is engageda pinion, b, journaled in a box, F, which latter is connected, as hereinafter described, with the armatures of the main and shunt magnets. The journal of pinion Z) projects out through one side of the box F, andhas a small ratchetwheel, d, secured to its outer end, an escapement-wheel, G, being loosely mounted upon said journal, inside of ratchet-wheel d, and receiving motion from the samein one direction through the medium of apawl, e, and springf.

H is an anchor, which engages with and regulates the rate of motion of escapementwheel G, said anchor being pivoted at g to an upright, 71, on the box F. Aweighted arm, 2, having an adjustable weight, 7., projects out from each end of anchor H, the said weights serving to prevent the too rapid oscillation of the anchor.

I represents a curved arm depending from box F, and projecting out 011 the side opposite to that wherein the pinion is journaled. Said arm I is forked at its lower end, where it receives a pivoted lever, K. One arm of said lever projects upwardly toward the escapement-wheel, its end being provided with adetent, I, which in the normal position of the lever engages with said wheel and prevents it from turning. The other and shorter arm of the lever K projects in horizontally toward the carbonrod and over a set-screw, L, in bottom plate, B.

It will be seen from the above arrangement of parts that when the box F and the carbonrod E are elevated, so that the short arm of lever K is out of contact with screw L, the detent will engage with the escapement-wheel and prevent its turning; but when ,through loss of magnetism in the helix, the box F is allowed to descend until said arm and screw come into contact, the lever is tilted, the detent disengaged, and the escapeinent is allowed to turn and the carbon-rod to descend until the current in the main magnet becomes stronger by the shortening of the arc, the box is elevated, and the detent engages with the escapement, as before.

Referring now to the connection of the box F with the armatures of the magnets C and D, M is a bracket fastened to the top plate, A, and provided with depending arms in m, having each at its lower end a pivotscrew, a, which serves as a fulcrum for a horizontal le ver, N, whose ends project out on either side between the helices of the main and shunt magnets. The lever N has a central opening for the passage of the carboirrod and the upright it of box F, and has attached to it, near one end, a retracting-spring, 0, which is secured at its lower end to an adjusting-screw, p", in bottom plate, B. The ends of lever N project through slots in the ends of the uprights 0 O, which are set upon and attached to the middles of the cross-plates I? 1?, to which the cores 1) 1) of the main and shunt magnets, respectively are attached. Pins q q in the uprights O 0 pass through slots T1" in the ends of lever N, and serve to pivotally connect the lever with the armatures of the mag nets 0 and D, so that the movement of said armatures up or down will oscillate the said lever.

. Q is a hanger attached to top plate, A, and having pivoted to its lower end a lever, B, whose forked end embraces the upright h of box F, a pivot, s, passing through h and into slots 25 in the end of lever B. The lever B rests upon the upper side of lever N at a, where said lever is made convex, as shown, so as to form a rocking support for lever Rthat is, it forms a changeable fulcrum for said leverso that as lever N ascends the point of contact of R and N will approach the pivotal point of R and recede from the pivotal point of N, and hence compensate by the change in leverage for the increase in power of the magnet O. The opposite end of lever N being connected to the armature of the shunt-magnet, the loss of power of the shunt-magnet is compensated for in the gain by leverage, and the movement of the carbon-rod is rendered per fectly uniform and steady.

The electric circuit through the lamp is as follows: Entering at bindingpost 1, the current traverses successively through the coils of the main magnet C, thence by wire 2 to brush 3, to carbon-rod E, through the carbons to binding-post 4. by wire 5. The shunt-circuit is by wire 6, from post 1, to shunt-magnet D, and thence by wire 7 to binding-post 4, where it joins the main circuit.

The operation of the invention is as follows: To insert the carbon in the carbon-rod the lat ter is pushed up a sufficient distance, the pinion and pawl revolving to the left and not turning the escapementwheel G. The carbon having been placed in position and the current admitted, the main magnet O is energized and draws in its cores, raising the le vers N and R and the box F and its attached parts. The first portion of the movement of the box raises the lever K out of contact with screw L and causes the detent to engage with the escapement-wheel G, and thus prevents the carbon from falling. As the carbon burns away and the arc lengthens, the main magnet loses strength and the shunt-magnet D gains strength and causes the lever N to oscillate and the carbon to descend. The escapeinent is inoperative in the downward descent of the carbon until the short arm of lever K comes in contact with the screw L, when at the slightest further movement downwardly of the carbon the detent is disengaged from the escapement-whcel and the latter begins to turn to the right,its rate of motion being governed by the anchor, and the carbon is allowed to descend, the arc becomes shorter, and the main magnet becoming more energetic, the carbon is raised, as before. In practice the descent of the carbon-rod is very regular, the slightest movement up or down being sufficient to cause the detent to engage or disengage with the escapement-wheel, the latter usually revolving but the distance of one tooth before being again stopped by the detent. The detent is operated by so slight a movement of the carbon-rod that the feed is practically c011- stant, and the are is maintained at about the same length during the entire time the lamp is burning.

I11 the present application, and in an application filed July 14, 1883, Serial No. 100,803, by J. T. McConnell, certain details are shown common to both forms of lamp. WVe therefore herein disclaim as of this application whatever is shown and described in said application of McConnell and not herein specifically claimed.

We claim as our invention 1. In an electricarc lamp, the combination of a helix, its armature, a carbon-feeding rod, and a lever oscillated by said armature and communicating its motion to the carbon-feeding rod through a changeable fulcrum, and adapted to mechanically equalize the variable attraction of said helix and exert a substantially uniform influence on the carbon-rod, substantially as described.

2. In an electric-arc lamp, the combination, with a carbon-rod connected with and adapted to operate an escapement-wheel, of a lever having a detent 011 its longer arm adapted to engage with the escapement, and a stop which impinges on the shorter arm of said lever, substantially as described.

3. In an electricarc lamp, an oscillating lever deriving movement from a helix in the arc-circuit, a carbon-feeding mechanism, and a supplemental 0r compounding lever interposed between said oscillating lever and carbon-feeding mechanism, and adapted to differentiate the attractive power of the helix, substantially as described.

4. In an electric-arc lamp, the combination of the lever B, pivoted to the fixed standard Q at one end, and at the other end engaging with the carbonrod feeding mechanism,brack et M, and the oscillating lever N, pivoted there in, embracing the carbon-rod and engaging at its respective ends with the armatures of the main actuating-helix O and the high-resistance derivation-helix I), substantially as described.

5. In an electric-arclamp, the combination,

with the toothed carbon-rod E, of the box F, carrying the feeding and releasing devices, said box having the upward extension 71, and being connected with the electromagnetic operative devices at its upper end, substantially as described.

6. In an electric-arc lamp, the combination of box F, carrying pinion b, and escapement G, with lever K, pivoted to an arm. 011 said box, having a detent on one end adapted to engage with said escapeinent, and impinging on a set-screw, L, at the other end, substantially as described.

In testimony that we claim the foregoing as our own We have hereto affixed our signatures 15 in presence of two witnesses.

THOMAS J. MGTIGHE. JOSEPH '1. MCCONXELL.

Witnesses:

T. J. Pxrrnnsox, D. E. DAVIS. 

